mm/mmap: write-lock VMAs in vma_prepare before modifying them

Write-lock all VMAs which might be affected by a merge, split, expand or
shrink operations.  All these operations use vma_prepare() before making
the modifications, therefore it provides a centralized place to perform
VMA locking.

[[email protected]: remove unnecessary vp->vma check in vma_prepare]
  Link: https://lkml.kernel.org/r/[email protected]
  Link: https://lore.kernel.org/r/[email protected]/
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Suren Baghdasaryan <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Liam R. Howlett <[email protected]>
Cc: David Howells <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Laurent Dufour <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Yu Zhao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions